avitex/glicko-elixir
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Code Issues Releases Wiki Activity

Tidy up

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avitex 2017-11-16 14:47:05 +11:00
parent b2e30a038c
commit 50e3349e92
1 changed files with 9 additions and 8 deletions
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17
lib/glicko.ex
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@ -21,7 +21,6 @@ defmodule Glicko do
|> do_new_rating(results, opts) |> do_new_rating(results, opts)
|> Player.to_v1 |> Player.to_v1
end end
def new_rating(player = %Player{version: :v2}, results, opts) do def new_rating(player = %Player{version: :v2}, results, opts) do
do_new_rating(player, results, opts) do_new_rating(player, results, opts)
end end
@ -45,7 +44,7 @@ defmodule Glicko do
|> Map.put(:opponent_rating_deviation, opponent.rating_deviation) |> Map.put(:opponent_rating_deviation, opponent.rating_deviation)
|> Map.put(:opponent_rating_deviation_g, calc_g(opponent.rating_deviation)) |> Map.put(:opponent_rating_deviation_g, calc_g(opponent.rating_deviation))
Map.put(result, :e, calc_e(player, result)) Map.put(result, :e, calc_e(player.rating, result))
end) end)
ctx = ctx =
@ -53,7 +52,9 @@ defmodule Glicko do
|> Map.put(:system_constant, Keyword.get(opts, :system_constant, @default_system_constant)) |> Map.put(:system_constant, Keyword.get(opts, :system_constant, @default_system_constant))
|> Map.put(:convergence_tolerance, Keyword.get(opts, :convergence_tolerance, @default_convergence_tolerance)) |> Map.put(:convergence_tolerance, Keyword.get(opts, :convergence_tolerance, @default_convergence_tolerance))
|> Map.put(:results, results) |> Map.put(:results, results)
|> Map.put(:player, player) |> Map.put(:player_rating, player.rating)
|> Map.put(:player_volatility, player.volatility)
|> Map.put(:player_rating_deviation, player.rating_deviation)
|> Map.put(:player_rating_deviation_squared, :math.pow(player.rating_deviation, 2)) |> Map.put(:player_rating_deviation_squared, :math.pow(player.rating_deviation, 2))
# Step 3 # Step 3
@ -108,8 +109,8 @@ defmodule Glicko do
(x - ctx.alpha) / :math.pow(ctx.system_constant, 2) (x - ctx.alpha) / :math.pow(ctx.system_constant, 2)
end end
defp calc_alpha(%{player: player}) do defp calc_alpha(ctx) do
:math.log(:math.pow(player.volatility, 2)) :math.log(:math.pow(ctx.player_volatility, 2))
end end
defp calc_new_player_volatility(%{a: a}) do defp calc_new_player_volatility(%{a: a}) do
@ -123,7 +124,7 @@ defmodule Glicko do
end end
defp calc_new_player_rating(ctx) do defp calc_new_player_rating(ctx) do
ctx.player.rating + :math.pow(ctx.new_player_rating_deviation, 2) * calc_results_effect(ctx) ctx.player_rating + :math.pow(ctx.new_player_rating_deviation, 2) * calc_results_effect(ctx)
end end
defp calc_new_player_rating_deviation(ctx) do defp calc_new_player_rating_deviation(ctx) do
@ -176,7 +177,7 @@ defmodule Glicko do
end end
# E function # E function
defp calc_e(player, result) do defp calc_e(player_rating, result) do
1 / (1 + :math.exp(-1 * result.opponent_rating_deviation_g * (player.rating - result.opponent_rating))) 1 / (1 + :math.exp(-1 * result.opponent_rating_deviation_g * (player_rating - result.opponent_rating)))
end end
end end